1-(4-Bromophenyl)-5-methoxy-1H-pyrazole-3-carboxylic acid CAS 263237-96-3
| CAS No. | 263237-96-3 |
| Molecular Formula | C11H9BrN2O3 |
| Molecular Weight | 297.10 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
1-(4-Bromophenyl)-5-methoxy-1H-pyrazole-3-carboxylic acid (CAS 263237-96-3) is a high-purity analytical reference standard with the molecular formula C11H9BrN2O3 and a molecular weight of 297.10 g/mol.
Structurally, 1-(4-Bromophenyl)-5-methoxy-1H-pyrazole-3-carboxylic acid (C11H9BrN2O3) contains a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, bromine substitution. The molecule exhibits a degree of unsaturation (DBE) of 8.0, corresponding to approximately 8 ring(s) or double-bond equivalent(s). With a molecular weight of 297.10 g/mol, it falls into the medium-molecular-weight range. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C11H9BrN2O3 |
| Molecular Weight | 297.10 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2025 |
| Halogen Content | Br-containing |
| Nitrogen Atoms | 2 |
Related Bromophenyl Standards
- Ethyl 5-(4-bromophenyl)-1,2,4-oxadiazole-3-carboxylate (CAS 1053656-27-1)
- 3-[5-(3-Bromophenyl)-1,2,4-oxadiazol-3-yl]propanoic acid (CAS 1196463-11-2)
- 1-(4-Bromophenyl)-6-oxo-1,4,5,6-tetrahydropyridazine-3-carboxylic acid (CAS 926202-92-8)
- 3-(3-(2-Bromophenyl)-1,2,4-oxadiazol-5-yl)propanoic acid (CAS 889946-79-6)
- 3-(3-(4-Bromophenyl)-1,2,4-oxadiazol-5-yl)propanoic acid (CAS 30149-94-1)
- Ethyl 3-(4-bromophenyl)-1,2,4-oxadiazole-5-carboxylate (CAS 861146-12-5)
- Ethyl 3-(4-bromophenyl)-1,2,4-oxadiazole-5-carboxylate (CAS 951626-15-6)
- Ethyl 5-(4-bromophenyl)-1,3,4-oxadiazole-2-carboxylate (CAS 931760-32-6)
Recommended Standards
- 1-(4-Bromophenoxymethyl)-1h-pyrazole-3-carboxylic acid (CAS 956573-70-9)
- Ethyl 7-bromo-4-oxo-1,4-dihydro-1,8-naphthyridine-3-carboxylate (CAS 1973158-10-9)
- 2-(5-Bromobenzofuran-2-yl)-2-oxoethyl acetate (CAS 503454-72-6)
- 4-bromo-3-(4-methoxyphenyl)-1h-pyraZole-5-carboxylic acid (CAS 182415-28-7)
- (4-Amino-1-methyl-1H-pyrazol-5-yl)(morpholino)methanone (CAS 312308-73-9)
- Alarmine (CAS 105-10-2)
- 1356019-49-2 (2R,15R)-2,15-Diamino-7,10-dioxa-4,13-dithiahexadecane-1,16-dioic acid--hydrogen chloride (1/2) (non-preferred name) DTXSID20747167 (CAS 1356019-49-2)
- tert-Butyl 2-[(2-oxo-2,3-dihydroimidazo[1,2-c]quinazolin-5-yl)sulfanyl]acetate (CAS 478045-98-6)
- 7-(4-Fluorophenyl)-2-methylpyrazolo[1,5-a]pyrimidine (CAS 478258-87-6)
- Stearic-D35 Acid (CAS 17660-51-4)
- (4-(4-(Tert-butoxycarbonyl)piperazine-1-carbonyl)-3-fluorophenyl)boronic acid (CAS 1704069-67-9)
- 4-cyclopropyl-4H-1,2,4-triazole-3-thiol (CAS 667437-96-9)
- 126251-01-2 Stigmast-5-en-3-yl beta-D-glucopyranosiduronic acid DTXSID90858395 (CAS 126251-01-2)
- Semaglutide impurity 84 (CAS CATO-C4X-222684)
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